--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libmlk-core/core/panic.c	Fri Oct 01 20:30:00 2021 +0200
@@ -0,0 +1,78 @@
+/*
+ * panic.c -- unrecoverable error handling
+ *
+ * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "core_p.h"
+#include "error.h"
+#include "panic.h"
+
+static void
+terminate(void)
+{
+	fprintf(stderr, _("abort: %s\n"), error());
+	abort();
+	exit(1);
+}
+
+void (*panic_handler)(void) = terminate;
+
+void
+panicf(const char *fmt, ...)
+{
+	assert(fmt);
+
+	va_list ap;
+
+	/*
+	 * Store the error before calling panic because va_end would not be
+	 * called.
+	 */
+	va_start(ap, fmt);
+	errorva(fmt, ap);
+	va_end(ap);
+
+	panic();
+}
+
+void
+panicva(const char *fmt, va_list ap)
+{
+	assert(fmt);
+	assert(panic_handler);
+
+	errorva(fmt, ap);
+	panic();
+}
+
+void
+panic(void)
+{
+	assert(panic_handler);
+
+	panic_handler();
+
+	/*
+	 * This should not happen, if it does it means the user did not fully
+	 * satisfied the constraint of panic_handler.
+	 */
+	fprintf(stderr, _("abort: panic handler returned\n"));
+	exit(1);
+}